[llvm] Reapply "[CFI] Create an external linkage alias instead of promoting i… (#220339) (PR #225173)

[Teresa Johnson via llvm-commits]

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+; When ThinLTOBitcodeWriter promotes an internal function by creating an external
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teresajohnson wrote:

Thanks, this is helpful. Could you actually put some version of this where you now invoke GlobalAlias::create?

https://github.com/llvm/llvm-project/pull/225173